/** Copyright 2013-2020 the original author or authors from the JHipster project.
 *
 * This file is part of the JHipster project, see http://www.jhipster.tech/
 * for more information.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

const Rules = require('./rules');
const EntityIssue = require('./issues/entity-issue');
const { getTableNameFromEntityName } = require('../jhipster/entity-table-name-creator');

let issues;

module.exports = {
    checkEntities,
};

/**
 * Check entities for lint issues.
 * That is done by passing the list of entity declarations from the CST (from the JDLReader output).
 * @param {Array} entityDeclarations - the list of entity declarations
 * @return {Array} the found entity issues.
 */
function checkEntities(entityDeclarations) {
    if (!entityDeclarations) {
        return [];
    }
    issues = [];
    checkForDuplicatedEntities(entityDeclarations);
    entityDeclarations.forEach(entityDeclaration => {
        checkForUselessEntityBraces(entityDeclaration);
        checkForUselessTableName(entityDeclaration);
    });
    return issues;
}

function checkForDuplicatedEntities(entityDeclarations) {
    const entityNames = new Set();
    const duplicatedEntityIssues = new Map(); // key: entityName, value: issue
    entityDeclarations.forEach(entityDeclaration => {
        const entityName = entityDeclaration.children.NAME[0].image;
        if (entityNames.has(entityName)) {
            if (!duplicatedEntityIssues.has(entityName)) {
                duplicatedEntityIssues.set(
                    entityName,
                    new EntityIssue({
                        ruleName: Rules.RuleNames.ENT_DUPLICATED,
                        entityName,
                    })
                );
            }
        } else {
            entityNames.add(entityName);
        }
    });
    duplicatedEntityIssues.forEach(issue => {
        issues.push(issue);
    });
}

function checkForUselessEntityBraces(entityDeclaration) {
    const entityBody = entityDeclaration.children.entityBody;
    const nextTokensAfterRelationshipType = entityBody && entityBody[0].children;
    const onlyCurlyBracesAsRelationshipBody = entityBody && Object.keys(nextTokensAfterRelationshipType).length === 2;
    if (onlyCurlyBracesAsRelationshipBody) {
        issues.push(
            new EntityIssue({
                ruleName: Rules.RuleNames.ENT_SHORTER_DECL,
                entityName: entityDeclaration.children.NAME[0].image,
            })
        );
    }
}

function checkForUselessTableName(entityDeclaration) {
    const entityName = entityDeclaration.children.NAME[0].image;
    const entityTableNameDeclaration = entityDeclaration.children.entityTableNameDeclaration;
    if (entityTableNameDeclaration) {
        const tableName = entityTableNameDeclaration[0].children.NAME[0].image;
        if (getTableNameFromEntityName(entityName) === tableName) {
            issues.push(
                new EntityIssue({
                    ruleName: Rules.RuleNames.ENT_OPTIONAL_TABLE_NAME,
                    entityName,
                })
            );
        }
    }
}
